The sicklefin chimaera (Neoharriotta pinnata) is a species of fish in the family Rhinochimaeridae found near Angola, the Republic of the Congo, the Democratic Republic of the Congo, Gabon, Ghana, Guinea, Liberia, Mauritania, Namibia, Senegal, Sierra Leone, and Western Sahara. It is also reported from Gulf of Mannar, India. Its natural habitat is open seas.
Neoharriotta pinnata has a total length of approximately at birth and reach maturity at a total length of . N pinnata has a long and narrow snout which is blunt at its edge. The spine of its first dorsal fin is taller than the fin itself. Its body is uniformly brown in colour. It has short, broad, and rounded pectoral fins.
Neoharriotta pinnata has been found to occur at depths of , but primarily between .
Apart from its regular distribution, a single specimen has been found in the Bay of Biscay. In 2018, it was reported in the waters of the Andaman and Nicobar Islands.
The sicklefin chimaera is oviparous, and its egg cases are spindle-shaped and reach in length and in width.
The sicklefin chimaera is categorised globally on the IUCN Red List as near threatened due to local reductions in population across multiple countries due to fishing.